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TPS71501DCKR

Ultra-low IQ LDO, 1.2μA, 2.5-24V input, 50mA, adjustable 1.2-15.5V, SC-70-5

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Manufacturer Part：

TPS71501DCKR

Package：

SC-70-5 (2.0 × 1.25 × 0.9 mm)

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Description

Product Overview

The TPS71501DCKR is an ultra-low quiescent current LDO voltage regulator from Texas Instruments with an adjustable output from 1.2V to 15.5V. It features an extremely low IQ of 1.2μA, making it ideal for battery-powered applications where standby current must be minimized. The device is packaged in a 5-pin SC-70 (DCK) package and supports up to 50mA output current.

Key Specifications

Function Ultra-Low IQ LDO Regulator
Input Voltage 2.5V to 24V
Output Voltage 1.2V to 15.5V (adjustable)
Output Current 50mA
Quiescent Current 1.2μA (typical)
Dropout Voltage 350mV at 50mA
PSRR 40dB at 100Hz
Package 5-pin SC-70 (2.0 × 1.25 mm)
Operating Temperature -40°C to +125°C

Features

  • Ultra-low quiescent current of 1.2μA typical
  • Wide input voltage range up to 24V
  • Adjustable output from 1.2V to 15.5V via external resistors
  • Noise reduction with external bypass capacitor
  • Thermal shutdown and overcurrent protection
  • Extremely small SC-70 footprint

Applications

  • Battery-powered instrumentation and meters
  • Portable medical devices
  • Always-on power rails in IoT sensors
  • Automotive body electronics
  • Industrial 4-20mA loop powered devices

The TPS71501 is an ultra-low quiescent current, high-input-voltage LDO regulator from Texas Instruments. With a typical IQ of only 1.2μA, it is specifically designed for battery-powered applications where long standby times are critical. The device supports input voltages up to 24V and provides up to 50mA output current with an adjustable output voltage set by an external resistor divider. The wide input range, ultra-low IQ, and tiny SC-70 package make it an excellent choice for always-on power rails in IoT, industrial, and automotive systems.

The TPS71501 uses a PMOS pass transistor controlled by an error amplifier that compares a fraction of the output voltage (via the FB pin and external resistor divider) with an internal bandgap reference voltage. The extremely low quiescent current is achieved by operating the error amplifier and bandgap reference at very low bias currents. A bypass capacitor on the NR/FB pin can further reduce output noise. When the output current exceeds the limit threshold, the internal current limit circuit reduces the gate drive to the pass transistor, protecting the device. Thermal shutdown activates when junction temperature exceeds the threshold, turning off the pass transistor until the temperature drops.

Pin Name Type Function
1 IN Power Input supply voltage (2.5V-24V)
2 GND Power Ground
3 EN Input Enable — high enables the device
4 FB Input Feedback — connect resistor divider from output
5 OUT Power Regulated output voltage
  • Always-on power rail for IoT sensor nodes with 10+ year battery life
  • Low-dropout regulation in 4-20mA loop-powered instruments
  • Post-regulation stage after switching converter for noise-sensitive circuits
  • Portable medical device standby power supply
  • Automotive body control module always-on rail
Manufacturer Part Number Package Notes
TI TPS71525DCKR SC-70-5 Fixed 2.5V output version
TI TPS71533DCKR SC-70-5 Fixed 3.3V output version
Microchip MCP1811T SOT-23-5 Low IQ LDO, 350nA IQ
Maxim MAX8873 SOT-23-5 Low IQ LDO, 3.2μA
Richtek RT9013 SOT-23-5 Low IQ LDO, similar spec
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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